"This is a message I never imagined I'd have to post. Tonight in Manchester, NH, three songs into the set Bret had me sing a song as he rushed off stage. In the nine years I've stood next to him, I've never seen a look like the one on his face as if I was a complete stranger. One of the crew returned instantly to notify me that Bret's blood sugar was extremely low."

Evick said that Michaels returned to the stage to announce that he could not continue.

"As you all know he is a health fanatic and fiercely monitors his blood sugar," Evick said. "He basically had to be dragged off the stage in his sickest of conditions. When I rushed to the bus he could barely speak, but begged me to apologize to the fans and seemed only concerned for them."

The guitarist said that paramedics were treating the singer, and that any updates would be issued later. Michaels is a lifelong diabetic and has raised hundreds of thousands of dollars for diabetes-related charities throughout his career.

UPDATE: On his Facebook page late on May 29, somebody representing "Team Bret" wrote the following: "Sending a huge shout out to all the paramedics both on and off duty who have assisted Bret tonight. No words can thank you enough for your help."